Intestinal colonization: How key microbial players become
established in this dynamic process
Clostridium cluster XIVa include Eubacterium rectale and Roseburia intestinalis, the productive butyrate factories that keep our gut mucous linings pink, pretty and pathogen-free. These guys eat everything.
They've certainly invaded their dual nices as both primary and secondary degraders of all things plant fiber and starch (in fact, both cooked and resistant). 10% of our digestible food escapes small intestine digestion and enter the colon for microbial fermentation. For a 150-200 g carb diet, this means about 15-20 grams digestible and cooked starch makes it into the mega composter (colon) and fill the big bellies of the flora like cluster XIVa. That's a lot of starchy food considering tens of millions of microbes may live in one gram of poop or soil.
Roseburia favors and loves starches that escape small intestinal degradation and RS3, cooked-cooled starches.
R. intestinalis works synergistically often with Bifidobacteria. Whatever starch fragments that Bifidobacteria throw away, R. intestinalis can munch over. If Bifido is not around (like after antibiotics), R. intestinalis might starve a little. On VLC diets, Roseburia drops along with starch intakes. What is most bothersome is that butyrate dips 4-fold as well.
Chitin (insects, Aspergillus) and beta-glucan (mushrooms, oats) feed Roseburia well (as does low dose RS2, green banana flour or RPS) in this study (Neyrink 2012).
High dose RS2 however will decrease Roseburia (Tachon 2013).
Roseburia's Favorite Foods Are: Starches, Inulin, RS3 Cooked-Cooled Resistant Starch
What raises Roseburia the MOST is starches and inulin (Van den Abeele et al 2011, others).
These fibers raise cluster XIVa nicely, at the same time protecting rodents from increased obesity, high insulin, high BGs, high TGs, and metabolic syndrome with an inflammation-inducing HF diet. All disease protection appears to correlate directly with Roseburia caecal population increases.
Feed Roseburia well for sustained longevity and health -- consider steps #1-4 to provide bifido and bionic fuel: